Instruments Faria Chesapeake Black SS2" Water Pressure Gauge Kit - 30 PSI

Is this just the gauge or does the mounting hardware tubing and fitting included

Will this kit work for a 1989 mariner 90hp 2 stroke?

is this a 2 in. gauge

My boat uses a pitot hose from the outboard to read water pressure. Will this work on my boat, or will I have to buy something else to make it work?